Checksum

Example: "Since the checksums of the CDs matched, he knew the discs were identical."

A checksum is a calculated sum used to check the integrity of a file. It can be generated from one of many algorithms, such as cyclic redundancy check (CRC) or a cryptographic hash function. When the checksums of two sets of data match, it indicates that the data sets are identical. Therefore, checksums are a quick and easy way to verify disk images, burned discs, and other types of files.